Hi, I checked if someone have the same problem as me, but I didn't find any similar.
There is a problem with number of trains after game update.
The usual number of maximum trains coming from engine house is now applied to all trains, bonus trains and career train.
To make it more clear: if the capacity of engine house is for example 15 and I have 3 bonus trains and of course career train, I can only have 11 normal trains.
What is more important, this happened when I bought new trains, so before this action everything was working as usual. Now game stop me from buying new trains saying that I reached maximum possible number of them.